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Finding the Fourth Proportional to 20,528.64, 30,786.89 and 8,839.13

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Solution

The fourth proportional to 20,528.64, 30,786.89 and 8,839.13 is: 13,256.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,528.64 : 30,786.89 = 8,839.13 : x
  2. Step 2: Convert to fraction form
    20,528.64/30,786.89 = 8,839.13/x
  3. Step 3: Cross multiply
    20,528.64x = 30,786.89 × 8,839.13
  4. Step 4: Simplify right side
    20,528.64x = 272,129,124.88
  5. Step 5: Solve for x
    x = 272,129,124.88/20,528.64
  6. Step 6: Final answer
    x = 13,256.07

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.